Detect Common Wiring Faults: Simply plug in to quickly identify outlet wiring issues using the indicator lights. This outlet tester helps ensure home socket safety. GFCI Detection: Features a GFCI test button to verify the trip function of GFCI outlets. Grounding Check: Accurately detects whether an outlet is properly grounded before using grounded appliances. Compact Design: Portable and easy to use. Designed for 110/125V AC, 50/60Hz, 3-wire outlets. Compatibility: US plug type, suitable for use in countries including Canada, Mexico, Thailand, Taiwan, the Philippines, and others with compatible outlets. Voltage: AC 110V Color: As shown Material: Plastic Package Includes: 1 x Plug Tester Note: Other items not included. Color may vary slightly due to lighting and display differences. Measurement error allowed within +/- 1-3 cm.